Mining drill



Patented Nov. 27, 1934 UNITED STATES TEN Goodman Manufacturing Company,

Chicago, V

111., a corporation of Illinois Application October 6,

6 Claims.

My invention relates to improvements in min- .ing drills and has, among other objects, to provide anew and improved mining drill having a new and improved bit detachably mounted thereon so that it may be readily removed when dull, said bit having a socket fabricated integral therewith so as to provide a simple and inexpensive bit which may be rigidly supported on and positively driven from the drill.

My invention may be more clearly understood with reference to the accompanying drawing wherein:

Figure 1 is a side elevation of the device embodying my invention;

Figure 2 is an enlarged side elevation of the device shown in Figure 1, with parts broken away and in section;

Figure 3 is an enlarged plan view of the device shown in Figure 1 with certain parts broken away and in section; and

Figure 4 is a sectional 4-4 of Figure 2.

Referring now in particular to the drawing, the

embodiment of my invention illustrated comprises a shaft 10 herein preferably shown as being hollow having a spiral conveyor ribbon 11 extending therealong and a shank 12 fixed to the forward end thereof adapted to support a bit 13.

The shank 12 may be held within the forward end of the hollow shaft 10 by any suitable means but is herein preferably shown as being shrunk within said hollow shaft. The shank 12 extends forwardly from the shaft 10 and is tapered throughout this forwardly extending portion and is provided with a groove 14 on its forward end adapted to engage the bit 13. A driving lug 15 is provided on the shank 12 adjacent the forward end of the hollow shaft 10 and is also adapted to engage the bit 13 to rotate said bit upon rotation of said shank and the hollow shaft 10.

Referring now in particular to the bit 13 and several of the novel features of my invention. Said bit is of an ordinary fish tail type and includes a plurality of cutting edges 16 extending forwardly from a stock 17.

The stock 17 has a socket fabricated integrally therewith. This socket is tapered to conform to the taper of the shank 12 and is formed by taking 0 a fiat stock and alternately forging strips 18 outwardly from each side of said stock. These strips may be formed in a manner similar to which expanded metal sections are formed as by hand forging or by means of dies. The strips 18 view taken along line 5 are of an arcuate shape and extend alternately 1930, Serial No. 486,5 81 (01. 255-69) outward from each side of the been provided for the oFFicE" stock 1'? toprovide an integral socket fabricated from said stock.

may thus be seen that a tapered socket has hit 13, which socket is formed from the ordinary flat stock of an ordinary fish tail bit and is integral with said bit without the addition of extra provides a simple forming a socket on material to the bit. and inexpensive means for a bit and efficiently support- This ing the bit on a shank or any other suitable bit supporting means for drilling.

As may be seen from Figure 4, the driving lug 15 engages each side of the stock bit upon rotation of the drill.

17 for driving the Thus it may be seen that the socket formed from the stock 17 of the bit 1 shank 12 so 3 may be inserted on the tapered that the groove 14 engages the bit 13 and the driving lug 15 engages the stock 17. This provides a substantial means for supporting a bit for drilling and under ordinary conditions no other means is needed to hold the bit to the drill. As herein shown, h provided to prevent the bit 13 f engaged from the shank 12 drill from the hole. suitable type but owever, means are rom becoming diswhen withdrawing the Said means may be of any as herein shown comprises a cotter pin 19 insertable through a hole 20 in the shank 12 adjacent the forwar engageable with the strips 18 d end thereof and of the stock 17 to prevent the bit 13 from becoming removed from the shank 12.

It may thus be seen that a new and improved drill has been provided which detachably supports a bit thereon so that it may readily be removed when dull and that sai d bit has a socket fabricated integrally therewith which receives a tapered drill shank for rigidly on the drill shank and efiicient form of bit and drill.

While I have herein shown supporting the bit provides a simple and and described one form in which my invention may be embodied, it willbe understood that the construction and arrangement of the various parts may be altered or changed without departing from the spirit or 1 I claim as my invention:

1. In a mining drill, a shank,

connectible with said shank a bit detachably including a stock having a plurality of cutting edges extending forwardly therefrom, a socket f orward from said stock including a plurality of alternately arranged integral arcuate shape d strips extending integral arcuate shaped strips extending frorri' each side of said stock and engageable with said shank, means for driving said bit from said shank including a slot on the forward end thereof engageable with said bit and a driving lug on said shank engageable with said. stock adjacent the rearward end thereof, and means to prevent removal of said bit from said shank comprising a pin detachably connectible with said shank adja-' cent the forward end thereof and engageable with said alternately outwardly extending strips.

3. In a mining drill, a shank having a transversely extending slot in the forward end thereof, a bit detachably connectible with said shank including a stock having a plurality of cutting edges extending forwardly therefrom, and means formed integral with said bit for detachably connecting said bit with said shank so said bit may be rotatably driven by said shank comprising a socket formed from the stock of said bit, said socket including a plurality of integral strips extending alternately outwardly from each side of the stock of said bit adapted to receive the shank of said mining drill and having a portion adapted to be received by the slot in said shank.

formed. by expansion of said 4. In a mining drill, a tapered shank, a bit de tachably connectible therewith including a stock having a plurality of cutting edges extending forwardly therefrom and an integral tapered socket formed by expansion of said stock adapted to be engaged by said tapered shank, and means for driving said bit from said shank comprising a slot on the forward end of said shank engageable with said bit and a driving lug on said shank engageable with said stock adjacent the rearward end thereof.

5. In a mining drill, a tapered shank, a bit detachably connectible therewith including a stock having a plurality of cutting edges extending forwardly therefrom and an integral tapered socket stock and including an integral strip extending from each side of said stock and adapted to receive the shank of said mining drill, and means for driving said bit from said shank comprising a slot on the forward end of said shank adapted to engage a portion of said bit.

6. In a mining drill, a tapered shank, a bit detachably connectible therewith including a stock having a plurality of cutting edges extending forwardly therefrom and an integral tapered socket formed by expansion of said stock and including an integral strip extending from each side of said stock and adapted to receive the shank of said mining drill, and means for driving said bit from said shank comprising ,a slot on the forward end of said shank adapted to engage a portion of said bit and a driving lug on said shank engageable with the stock of said bit.

FREDERICK W. VODOZ. 

